body {
  margin: 0;
  background: black;
  color: white;
  font-family: 'Helvetica Neue", Helvetica, Arial, sans-serif;
  overflow-y: auto;
}

:lang(zh) {
  font-family: 'PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
}





nav#sidebar {
  z-index: 10;
  position: fixed;
  left: 0;
  top: 0;
  width: 10vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 2rem;
  background: transparent;
  margin-left: 0.7rem;

}

nav#sidebar a {
  margin: 1rem 0;
  color: yellow;
  text-decoration: none;
  font-weight: bold;
  font-size: 0.7rem;
  padding: 0.3rem 0.3rem;
  transition: transform 0.3s, text-shadow 0.3s, border 0.3s;
  text-shadow: 1px 1px 0 black, -1px 1px 0 black, 1px -1px 0 black, -1px -1px 0 black;
  border: 2px solid transparent; /* 初始无边框 */
  border-radius: 8px;
}

nav#sidebar a:hover {
  transform: scale(1.5);
  text-shadow: 0 0 30px pink;
}

nav#sidebar a.active {
  border-color: purple; /* 紫色边框 */
  transform: scale(1.4);
  text-shadow: 0 0 20px purple;
}

.sparkle {
  position: fixed;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  animation: sparkle 2s infinite ease-in-out;
  opacity: 0.7;
  pointer-events: none;
  z-index: 3;
}

@keyframes sparkle {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.5); }
}

/* Responsive container */
.content {
  margin: 2rem auto;
  padding: 1rem;
  max-width: 1100px;
  color: white;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: yellow;
}

p {
  font-size: 1.rem;
  line-height: 1.6;
  margin-top: 1rem;
  color: purple;
  font-weight: bold;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 25px;
  height: 0;
  margin-top: 2rem;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-description {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: #ccc;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 32px 0;
}

.gallery img {
  width: 100%;
  display: block;
}


@media screen and (max-width: 768px) {
  .content {
    padding: 1rem;
    margin-left: 2.8rem;
  }
}

#sidebar .lang-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

#sidebar .lang-btn img {
  display: block;
}

/* 初始隐藏 sidebar，避免加载时文字闪烁 */
#sidebar {
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

/* 初始化完成后显示 sidebar */
body.sidebar-ready #sidebar {
  opacity: 1;
  pointer-events: auto;
}


@media screen and (max-width: 768px) {
  nav#sidebar {
    width: 14vw;            /* 稍微变宽一点，避免文字换行 */
    padding-top: 1rem;      /* 顶部留白减少 */
  }

  nav#sidebar a {
    margin: 0.4rem 0;       /* ✅ 减小间距 */
    font-size: 0.6rem;      /* ✅ 字体稍小 */
    padding: 0.2rem 0.2rem; /* ✅ 内间距缩小 */
  }

  .content {
    margin-left: 3rem;      /* 保证正文不被侧边栏挡住 */
    padding: 0.8rem;
  }
}